Imaginary Picture of TOI-1247 b

Display orbital revolution of TOI-1247 b around the hoststar TOI-1247
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Exoplanet Name : TOI-1247 b
Alternate Name : HD 135694 b
Status : Confirmed
Radius (Rjup / Re): 0.2239 (Rjup) 2.5097 (Rearth)
Mass (Mjup / Me): 0.0179 (Mjup) 5.6911 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0000 (AU) 0.1247 (AU Est.)
Eccentricity : 0.4200
Orbital Period(Yrs) 0.0436
Orbital Period(Observed/Estimated) 15.92 (Days Obs.) 0.00 (Days Est.)
Surface Gravity (G Earth) 0.9036
Star Radiation at Atmospheric Boundary: 97211.8 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 788.1 (K)
Blackbody T 0.3(K) 740.1 (K)
Blackbody T 0.7(K) 598.8 (K)
Tidally Locked Blackbody T 0.1(K) 937.2 (K)
Tidally Locked Blackbody T 0.3(K) 880.1 (K)
Size Class: sub-Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection : Radial Velocity
Radius Detection : Primary Transit
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : TOI-1247
Alternate Name :
Star Distance(LY) : 240.9
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.0 (Msun Measured) 1.0 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 5712 (K)
Spectral type : G4
UV portion[%]: 7.6
Visible portion[%]: 44.5
IR portion[%]: 47.9
Metalicity : 0.0
Absolute Magnitude: 4.8
Apparent Magnitude: 9.1
Right Ascension(RA) 227.8667
Declination (DEC) 71.8411
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors
Discovery Paper - Title
Discovery Paper - Journal
Discovery Paper - URL
SIMBAD LINK
Open Exoplanet Database Link
TOI-1247 b
TOI-1247 b

  • TOI-1247 b is an exoplanet orbiting the star TOI-1247, located about 240.9 light-years (73.9 pc) away from Solar System. Its discovery was publicly announced on 2019.
  • The host star TOI-1247 has apparent magnitude of 9.1, with absolute magnitude of 4.8.
  • It is 1.0 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5712 with its spectral types of G4
  • In this planetary system, the extrasolar planet TOI-1247 b orbits around the star TOI-1247 every 15.9 days with its orbital distance of 0.12 AU ( 18653354.6 km)
  • (Projected orbit of TOI-1247 b around its host star TOI-1247)


  • The Star TOI-1247 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.761 AU ( 113774983.5 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.051 AU ( 157266760.2 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.602 AU ( 239639739.5 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.357 AU ( 352640374.6 km)
  • Radiation at Planetary Boundary of TOI-1247 b : 97211.82 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star TOI-1247)



  • Kopparapu Recent Venus for Star TOI-1247 distance : 0.791 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star TOI-1247 distance : 1.002 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star TOI-1247 distance : 0.968 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star TOI-1247 distance : 1.061 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-1247 distance : 1.773 AU
  • Kopparapu Outer Boundary for Early Mars for Star TOI-1247 distance : 1.870 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star TOI-1247)



  • Original Kopparapu Recent Venus for Star TOI-1247 distance : 0.791 AU
  • Original Kopparapu Runaway Greenhouse for Star TOI-1247 distance : 1.030 AU
  • Original Kopparapu Moist Greenhouse for Star TOI-1247 distance : 1.047 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star TOI-1247 distance : 1.804 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star TOI-1247 distance : 1.876 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star TOI-1247)



    (Position in Stellar Map of star TOI-1247 and its Exoplanet TOI-1247 b)



    (Zoomed position in Stellar Map of star TOI-1247 and its Exoplanet TOI-1247 b (zoom level 3))

    (Synthetic Spectrum of star TOI-1247*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102